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Mathematical Modeling of Phosphorus Losses from Land Application of Hog and Cattle Manure

^a Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada T6G 2E3
^b Plant Industry Division, Alberta Agriculture, Food and Rural Development, Edmonton, AB, Canada T6H 4P2

View larger version (33K): [in a new window]   Fig. 1. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 6 yr of different manure treatments (H, hog; C, cattle) at Calmar (see Table 1).

View larger version (34K): [in a new window]   Fig. 2. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 6 yr of different manure treatments (H, hog; C, cattle) at Devon (see Table 1).

View larger version (28K): [in a new window]   Fig. 3. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 3 yr of different manure treatments (H, hog; C, cattle) at Ellerslie (see Table 1).

View larger version (27K): [in a new window]   Fig. 4. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 3 yr of different manure treatments (H, hog; C, cattle) at Cooking Lake (see Table 1).

View larger version (32K): [in a new window]   Fig. 5. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 6 yr of different manure treatments (H, hog; C, cattle) at Lacombe (see Table 1).

View larger version (32K): [in a new window]   Fig. 6. (a) Runoff, (b) sediment loss, (c) dissolved inorganic phosphorus (DIP) concentration in runoff, and (d) total phosphorus (TP) loss in runoff and sediment, measured (symbols with vertical bars showing standard error) and modeled (lines) during 90 min of controlled rainfall on soils after 6 yr of different manure treatments (H, hog; C, cattle) at Ponoka (see Table 1).

View larger version (42K): [in a new window]   Fig. 7. (a) Mass and (b) concentration of total P in runoff and sediment modeled with annual applications of 0, 30, 60, 90, and 120 Mg ha–1 of cattle manure (Table 3) during 60 yr under repeated sequences of 1995–2000 climate data for the Lacombe ecodistrict (annual precipitation in 1995 = 435 mm, 1996 = 604 mm, 1997 = 534 mm, 1998 = 466 mm, 1999 = 450 mm, 2000 = 461 mm). Note logarithmic scale on vertical axis.